Oil Of Lavender is of two kinds, the fine-scented English oil, and the cheaper foreign oil, called oil of spike; these are rather more volatile and more powerful solvents than the oil of turpentine, which render them preferable in enamel painting, of which they are the proper vehicles; they have otherwise no advantage over the latter oil, unless they be fancied for their perfume. The other essential oils, such as oil of rosemary, thyme, etc, are very numerous; but it has not appeared that they possess any property that gives them superiority in painting over that of turpentine: some of them have, however, more power in dissolving resins in the making of varnishes, as is the case also with naphtha or petroleum, and the rectified oil of coal tar, the intolerable scent of which latter is a prohibition to its use in any familiar work.